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As we all suspected, the official word has finally come out: Â the whole “I’ve given up acting and I’m now a hip-hop star” weirdness from Joaquin Phoenix was all part of something he calls “performance art” and the rest of us call “being a jackass for no reason.” Â Casey Affleck, younger brother of Ben Affleck, directed the film I’m Still Here, documenting Phoenix’s alleged transformation into a king of the hip-hop lifestyle. Â The film got a lot of negative criticism, and even more people worried that Joaquin Phoenix was in need of an intervention. Â Affleck now says that he assumed people would have known the movie was a fake, but claims that it was not a hoax, it was just actors doing their job – acting. Â Joaquin Phoenix is due to be on Letterman tomorrow night, and after having shown up as his hip-hop character for a previous Letterman interview, Phoenix has quite a lot of explaining to do tomorrow.